Grinding wheel



E. B. GARDNER.

GRINDING WHEEL.

APPLICATION FILED APR. 8. I920.

'mmam Patented May 9, 1922.

PATENT OFFICE.

EDWARD B. GARDNER, OF BELOIT, W ISCONSIN.

GRINDING WHEEL.

of which the following is a specification.

This invention relates in general to. grinding wheels and has more particular reference to that type of wheel which presents a grinding face perpendicular to the axis of rotation.

Grinding wheels of this character heretofore employed comprise a flat faced disc of metal, to the face of which an abrasive sheet such as emery cloth is secured by glue, cement or the like. Since such a sheet is necessarily relatively thin, being customarily not over-fith of an inch in thickness, the sheet quickly wears through in service, necessitating frequent renewals. The method of renewing these sheets is to strip the worn sheet from the face of the metal disc, and then apply a new sheet, which operation requires the use of cement and of a wheel press in which the metal disc and the sheet applied thereto are subjected to pressure for the purpose of firmly and smoothly securing the sheet to the disc.

This method of renew'alis slow and expensive and in addition, grinding wheels of this character are suitable only for dry grinding work, since wet grinding will destroy the abrasive sheet and loosenit from' the supporting disc.

One of the primary objects of my present invention. is to provide a grinding wheel which will obviate the objections to grinding wheels now employed, and with this'end in view, I have provided a wheel in which the abrasive or grinding element may be of any desired-thickness, and customarily, will be at least one inch thick. An abrasive element of this character can obviously'be used for a long periodof timeibefore it is worn out and when renewal becomes necessary, the

worn element may be removed, and a new one substituted quickly and easily by means of improved fastening devices, which my invention contemplates, for securing the abrasive element to its supporting disc and without the use of special tools or 0f a wheel Specification of Letters Patent.

Application filed April 8,

Patented May 9, 1922.

1920. Serial Nb. 372,239.

press or other similar machine, which has heretofore been necessary.

A further object of my invention is to provide as an article of manufacture, an abraslve element which may be sold to users and mounted by them upon the supporting disc quicklv and easily with unskilled labor, each abrasive element being adapted for prolonged use without renewal and being suitable for either wet or dry grinding, as may be desired.

Other objects and many of the'inherent advantages of my invention will be readily appreciated, as the same becomes better understood, by reference to. the following description, when considered in connection with the accompanying drawings.

Referring to the drawings:

Fig; 1 is a rear elevation of a grinding wheel embodying my invention; 1

Fig. 2 is a diametral sectional view of my improved grinding wheel, taken on the line 2-2 of Fig. 1

Fig. 3 is a detail of one of the anchor bolts by which the abrasive element is detachably secured to the metal supporting disc; and,

Fig. 4 is a detail of an anchor nut adapted for engagement with said bolt.

From an inspection of the drawings, it Will be observed that my improved wheel comprises a disc 4, preferably made of steel or other material possessing suflicient strength and rigidity and adapted to be purpose in view, thedisc is provided with a central aperture 5, adapted to fit over the end of a shouldered shaft (not shown) and in 'mounted upon a rotating shaft. With this and into the shaft or a, collar thereon to lock the disc to the shaft. I The abrasive element designated generally by reference character 7 is composed of suitable abrasive material and obviously, may be of any desired thickness and size and is disc shaped, presenting a fiat rear face, opposed to the supporting disc 4, and a'flat front face 8 which presents a flat grinding surface of substantial area. This abrasive element may be solid, ifdesired, but for purposes of economy and lightness, it preferablyhas a central aperture 9, which'also permits access to the locking bolts or screws disposed in the holes 6 so that the wheel, consisting of the disc 4 and the abrasive element 7, can be bodily attached to or removed from the supporting shaft when desired. For the purpose of reinforcing and strengthening the abrasive disc circumferentially and to prevent the same from chipping or breaking away at the inside edge, I prefer to apply a metal band 11 at this point, the abrasive element being provided with a groove to receive the band so that the outer edge of the band will lie flush with the circumference of the abrasive disc. To insure a snug fit, a cushion 12 of lead or other suitable material may be interposed between the opposed faces of the abrasive disc and the strengthening band.

The abrasive element 7 is constructed as an article of manufacture independently of its supporting disc 4 and is detachably secured to this disc for use by means of suitable attaching devices of any preferred construction. I have illustrated on the drawings, one practical and preferred type of attaching device, consisting of anchor bolts and anchor rings or nuts mounted in the abrasive element itself. The anchor rings are designated by reference characters 10 and 13, and as will be apparent from Fig. 2, they are tapered transversely and adapted to be inserted in simi larly shaped undercut grooves or sockets 14 formed in the rear face of the abrasive element, and each ring is securely anchored in its groove by a surrounding quantity of lead 15 or other material, which may be poured into the grooves around the rings and will harden therein to firmly anchor the rings to the disc. v y

I have shown for purposes of illustration, two anchor rings but obviously, more may be employed if desired. In conjunction with the rings and as supplementary fastening means, I may utilize a seriesof anchor nuts .20 of tapered formation and, seated in undercut sockets wherein they are anchored by lead or'other anchoring means in the same manner asthe rings. The rings and nuts may be used as alternative constructions or they may bothbe used in the same disc arranged as shown in the drawings or otherwise, as preferred.

The anchor. bolts are designated generally by reference character 16 and these bolts arepreferably provided with flared heads17, each recessed at its outer end as indicated at 18, to receive a hexagonal or other shaped internal wrench. The supporting disc 18. is provided with countersunk openings 19 to receive these anchor bolts, so that the bolts may-be projected, through the openings and threaded into the anchor rings or nuts as the case may be, to detachably secure the abrasive element 8 to the supporting disc.

In order to insure a snug fit of the abrasive element against the face of the support ng disc, and also to avoid injury to the abrasive element, I prefer to interpose between this element and the disc 4, a pad or sheet 21 of suitable material, such as blotting paper, for instance, or other relatively soft material,

which will afford a suitable cushion between a firm and secure attachment while at the same time enabling the element to be readily removed from the disc when required, and further, this means of attachment leaves no projecting parts which might catch the clothes of an operator and cause accidents.

The wheel as a whole, comprising the supporting disc and the abrasive element, may

be assembled and shipped as a unit from the factory to the user, who can-readily attach it to the shaft in the manner previously described without disconnecting the abrasive element from its disc. Subsequently, the abrasive elements may be purchased for replacement without purchasing a new supporting disc, and the old element when worn down can be readily removed and re- I placed by a new one quickly and easily, and by unskilled labor. The grinding wheel presents an unbroken grinding surface of considerable area, which can be used for either wet grinding or dry grinding, without injury to the wheel, and since the abrasive element is of substantial thickness, it will' wear for a considerable period of time without replacement.

It is believed that my invention and many of its attendant advantages will be understood v and appreciated from the foregoing without further description, and while I have shown and described a preferred embodiment thereof, it should, be understood that the invention'is capable of considerable modification in its structural details, without departing. from the essence of the invention as defined in the following claims.

I claim: v 1. As an article of manufacture, an integral continuous circular abrasive element composed of abrasive. material presenting a 'grlndlng face perpendicular rotation, the rear face of said element havlng a plurality of anchoring devices emto its axis of bedded therein and fixedly secured thereto, element composed of abrasive material of which devices areiadapted to receive fastensubstantial thickness and provided with ing members by which said element may be a circumferential reinforcing band and 10 detachably mounted upon a rotating supequipped on its rear face with attaching de- 5 port. vices for attachment of the element to a ro- 2. An article of manufacture, comprising tating supporting disk.

an integral substantially circular abrasive EDWARD B. GARDNER. 

